The tritium quantity stored in a steel pressure vessel decreases with time because of helium-3 decay and permeation of tritium into the steel wall of the pressure vessel.Meanwhile,the tritium quantity permeating into ...The tritium quantity stored in a steel pressure vessel decreases with time because of helium-3 decay and permeation of tritium into the steel wall of the pressure vessel.Meanwhile,the tritium quantity permeating into the steel wall also decreases with time due to helium-3 decay and diffusion in and out of the wall of tritium.Tritium and helium-3 in the steel wall will cause hydrogen and helium embrittlement of the wall material,respectively,and thereby change the carrying capacity of the vessel.Taking contemporarily both decay and permeation of tritium within the vessel and decay and diffusion of tritium having permeated into the wall into consideration,the governing equations of tritium and helium-3 contents in the wall were established and solved,and relevant formulas were deduced.Through analytical calculations,curves of tritium and helium-3 contents versus radius and time were theoretically plotted,the contents spatio-temporal distributions laws were obtained,and a law about helium-3 contents distribution in steel wall of a spherical pressure vessel was discovered which was called the law of double helium-3 content.展开更多
A new set of global phenomenological optical model potential parameters has been obtained for helium-3 projectile,by simultaneously fitting the experimental data of helium-3 total reaction cross sections and elastic s...A new set of global phenomenological optical model potential parameters has been obtained for helium-3 projectile,by simultaneously fitting the experimental data of helium-3 total reaction cross sections and elastic scattering angular distributions in the mass range of target nuclei 20 A 209 at incident energies below 250 MeV.A comparison has been made between the extracted helium-3 global optical model potential parameters and the existing ones.The calculated results of total reaction cross sections and elastic scattering angular distributions are also compared with experimental data with their satisfactory agreement.展开更多
A potential version of the UrQMD(UrQMD/M) transport model and a traditional coalescence model are combined to calculate the production of ~3He fragments in central Pb+Pb collisions at SPS energies 20-80 Ge V/nucleon. ...A potential version of the UrQMD(UrQMD/M) transport model and a traditional coalescence model are combined to calculate the production of ~3He fragments in central Pb+Pb collisions at SPS energies 20-80 Ge V/nucleon. It is found that the Lorentz transformation in the afterburner influences visibly the ~3He yield and should be considered in calculations. The rapidity distribution of ~3He multiplicities(including the concave shape) can be described well with Ur QMD/M when it stops during t_cut=(100±25) fm/c and the coalescence afterburner with one parameter set of(R_0,P_0)=(3.8 fm, 0.3 Ge V/c) is taken into use afterwards.展开更多
基金supported by Science and Technology Development Fundation of Academy of Engineering Physics (Grant No2008A0301010)
文摘The tritium quantity stored in a steel pressure vessel decreases with time because of helium-3 decay and permeation of tritium into the steel wall of the pressure vessel.Meanwhile,the tritium quantity permeating into the steel wall also decreases with time due to helium-3 decay and diffusion in and out of the wall of tritium.Tritium and helium-3 in the steel wall will cause hydrogen and helium embrittlement of the wall material,respectively,and thereby change the carrying capacity of the vessel.Taking contemporarily both decay and permeation of tritium within the vessel and decay and diffusion of tritium having permeated into the wall into consideration,the governing equations of tritium and helium-3 contents in the wall were established and solved,and relevant formulas were deduced.Through analytical calculations,curves of tritium and helium-3 contents versus radius and time were theoretically plotted,the contents spatio-temporal distributions laws were obtained,and a law about helium-3 contents distribution in steel wall of a spherical pressure vessel was discovered which was called the law of double helium-3 content.
基金supported by the National Natural Science Foundation of China (Grant No. 11175260)China Ministry of Science and Technology (Grant No. 2007CB209903)
文摘A new set of global phenomenological optical model potential parameters has been obtained for helium-3 projectile,by simultaneously fitting the experimental data of helium-3 total reaction cross sections and elastic scattering angular distributions in the mass range of target nuclei 20 A 209 at incident energies below 250 MeV.A comparison has been made between the extracted helium-3 global optical model potential parameters and the existing ones.The calculated results of total reaction cross sections and elastic scattering angular distributions are also compared with experimental data with their satisfactory agreement.
基金the National Natural Science Foundation of China(Grant Nos.11375062,11275068,11505056,and 11505057)the project sponsored by SRF for ROCS,SEM,the Education Bureau of Zhejiang Province(Grant No.Y201533176)the Doctoral Scientific ResearchFoundation(Grant No.11447109)
文摘A potential version of the UrQMD(UrQMD/M) transport model and a traditional coalescence model are combined to calculate the production of ~3He fragments in central Pb+Pb collisions at SPS energies 20-80 Ge V/nucleon. It is found that the Lorentz transformation in the afterburner influences visibly the ~3He yield and should be considered in calculations. The rapidity distribution of ~3He multiplicities(including the concave shape) can be described well with Ur QMD/M when it stops during t_cut=(100±25) fm/c and the coalescence afterburner with one parameter set of(R_0,P_0)=(3.8 fm, 0.3 Ge V/c) is taken into use afterwards.
